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file E (Stack)Cittert, P. H. van
"The "van Leeuwenhoek Microscope" in possession of the University of Utrecht"
offprint from The Proceedings of the Koninklijke Akademie van Wetenschappen te Amsterdam, vol. XXXV no. 8, 1932. (Communicated at the meeting of October 29). Presented by the author
[1952- ]
1932